feat(skydiver-profile): add SkydiverProfile MySQL model and service

Introduces the skydiver_profile table as an optional 1-to-1 extension
of the user table, holding skydive-specific fields (licence, poids,
bg_image). Wired up with Sequelize associations and a service with
upsert support. Migration, model, relationships, and service layer
all included.

src/database/models/mysql/SkydiverProfile.js

@@ -0,0 +1,49 @@
+const { DataTypes, Model } = require("sequelize");
+const sequelize = require("../../config/sequelize");
+
+class SkydiverProfile extends Model {}
+
+const SkydiverProfileModel = () => {
+    SkydiverProfile.init(
+        {
+            userId: {
+                type: DataTypes.STRING(36),
+                allowNull: false,
+                primaryKey: true,
+                references: {
+                    model: 'user',
+                    key: 'id'
+                }
+            },
+            licence: {
+                type: DataTypes.INTEGER,
+                allowNull: true
+            },
+            poids: {
+                type: DataTypes.FLOAT,
+                allowNull: true
+            },
+            bg_image: {
+                type: DataTypes.STRING(255),
+                allowNull: true
+            }
+        },
+        {
+            sequelize,
+            tableName: 'skydiver_profile',
+            timestamps: true
+        }
+    );
+
+    SkydiverProfile.prototype.toJSONFor = function () {
+        return {
+            licence: this.licence,
+            poids: this.poids,
+            bg_image: this.bg_image || '/assets/images/users/bg_user.jpg'
+        };
+    };
+
+    return SkydiverProfile;
+};
+
+module.exports = SkydiverProfileModel;

src/database/models/mysql/index.js

@@ -10,6 +10,7 @@ exports.Product = require('./Product');
 exports.ProductCategoryXref = require('./ProductCategoryXref');
 exports.ProductTagXref = require('./ProductTagXref');
 exports.Role = require('./Role');
+exports.SkydiverProfile = require('./SkydiverProfile');
 exports.Tag = require('./Tag');
 exports.TagList = require('./TagList');
 exports.User = require('./User');